Accession Number : AD0622284

Title :   PROGRAMMING IMPLICATIONS OF THE NRL AN/GYK3(V) DISK STORAGE SYSTEM.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Smith,R. H.

Report Date : SEP 1965

Pagination or Media Count : 20

Abstract : The prototype AN/GYK-3(V) computer was equipped with a limited amount of memory; thus, it was considered necessary to increase this memory capacity in order to permit the application of this machine to future work in radio propagation and to have available a larger prototype memory for production AN/GYK-3(V)'s. The material presented here covers the programming implications of the NRL Disk Storage System. The system provides a fifteen fold increase in the on-line memory capacity as well as an unlimited increase in off-line capacity through the use of removable disk packs. The system consists of three IBM 1311 Disk File Drives and a File Control Unit (FCU) with each Disk File Drive having a capacity of 409,500 48-bit words. Read or write operations are accomplished with two modes of seek, Return to Home (RTH) and Direct, each rendering a minimum seek time under certain conditions. The average cylinder seek time is 250 ms for RTH and 150 ms for Direct. A special feature is included with this system allowing for a write check of written data without using valuable computer time.

Descriptors :   (*DISK RECORDING SYSTEMS, MEMORY DEVICES), (*MEMORY DEVICES, DISK RECORDING SYSTEMS), (*DATA STORAGE SYSTEMS, DISKS), (*COMPUTER PROGRAMMING, DISK RECORDING SYSTEMS), COMPILERS, CONTROL SEQUENCES, COMPUTER LOGIC, DIGITAL COMPUTERS, NAVAL RESEARCH

Distribution Statement : APPROVED FOR PUBLIC RELEASE